Air-exhaust for heating systems.



A. P. CROSBY.

AIR EXHAUST FOR HEATING SYSTEMS. APPLlcAnoN HLED 1AN.20. 1916.Y

1,217,281. Patented 1wb.27,'191'f.`

mg Namns Puces co.. ruomumo. wnsnmumn. n. c4

' casing 9.

ARTHUR i?. CROSBY, or MINNEAPoLrs, iurnuanso'ia.j

AIR-EXHAUST FOR HEATING SYSTEMS.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed January 20, 1916. Serial No. 73,143.

To all whom t may concern.'

Be it known that I, ARTHUR citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new .and useful Improvements in Air-Exhausts for Heating Systems, of which the following is a specication.

My invention relates to vapor heating systems and the object of the invention is to provide means in connection with the return. seal for sucking or exhausting the air out of the radiator as fast asit accumulates therein.

A further object is to provide a return seal of comparatively simple construction and one which will be inexpensive to manufacture, and easily accessible for examination or repairs.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is a side elevation illustrating my invention applied to a radiator,4

Fig. 2 is a sectional view through the return seal, showing the inner construction thereof, Y

Fig. 3 is a horizontal sectional view on the line x-x of Fig. 2.

In the drawing, 2 represents a vapor supply pipe having a connection A3 with a valve ,4 and a radiator. 5. 6 is a return pipe and 7 a connection leading therefrom to a nipple 8 formed on the lower end of a The upper end of this casing has a coupling 10 for connection with the lower portion ot1 the radiator. In thel top of the casing is a removable cap 11 which, when removed, allows access to the interior of the casing. In the bottom of the casing is a port 12 and mounted therein is a casting 13 having a passage 14 extending vertically therein and communicating with the nipple Sthrough the port 12 and extending over a partition 15 to communicate with a passage 16 having an open end'17 near the bottom of the casing. These passages and the partition form a siphonic discharge.

In the upper wall of the arch ofthe siphon a restricted passage 18 is formed having its inlet in communication with the passage through the coupling 10 with the radiator or other heating agent and leading to the passage 14. This restricted passage is normaly above the level of the liquid in the sea lVhen vapor or steam is first admitted to a cold radiator and contacts with the wall thereof, there will obviously be a much greater accumulation of water of condensation and also a larger volume of air to dispose' ofi than when the radiator becomes thoroughlyheated. This water of conden sation is in sufficient volume to iill the trap, overflow the wall or dam 15 and fill the passage above the wall sufficiently to start siphonic action and as soon as such action is established, the air will be drawn out of the radiator and the vapor be allowed to enter all sections thereof, the rapid condensation cont-inuing and the siphonic discharge being maintained until the air is withdrawn and the walls of the radiator heated. As soon as the radiator becomes heated, the volume of the water of condensation will automatically be reduced and thereupon the liquid inthe trap will form a seal and prevent the passage of the'vapor through the radiator, the slight accumulation of the water of condensation after the radiator is once thoroughly heated being disposed of by overflow oi3 the upper edge of the dam 15. If for any reason the supply of water of condensation to the trap increases as by the cooling of the walls of the radiator, and air again collects in the sections, then siphonic action will automatically begin again as `soon as the arch of the siphon is filled and the air will be sucked out and the siphonic action continued until the radiator is heated suiliciently to reduce the supply of water of condensation to a point where it merely acts as a seal for the discharge end of the radiator.v The restricted passage 18, in connection with the siphonic action, has a pumping effect on the radiator and automatically pre- Vents the accumulation of air therein and the non-heating of the radiator sections.

The removal of air 'from the radiator without taking the vaporwith it has been a difficult problem in vapor and steam heating systems, but I am able with this device to eil'ect a separation oi the vapor and air through the accumulation of the water of condensation, the removing means becoming effective only when the water is in sufficient quantity to prevent or retard the heating of the sections, and at this time condensation will be sufficiently rapid to set up siphonic action and remove the air accumulation.

Under normal conditions, When all the sections of the radiator are filled With vapor or steam and the Walls heated, the device becomes a seal, but the moment an abnormal quantity of Water of condensation accumulates, and this, of course, occurs when the Walls of the radiator are cold and there is present in them a considerable volume of air, the Water Will rise and set up siphonic action until the air is removed and the condensation reduced to a point Where it is insufficient to establish a siphonic discharge.

In case the radiator is shut ott, I prevent freezing of the seal by providing a second restricted passage 19 in the lower Wall of the casting through which the accumulation of Water in the casting may flow to the return.

In various Ways the details of construe-- tion herein shown and described may be modified and still be Within the scope of my invention.

I claim as my invention:

1. A return seal for a vapor heating system having ports in communication with a radiator and with a return pipe and provided With a siphon leading to said return pipe, said siphon having a restricted passage With its inlet in communication With said radiator port and above the level of the liquid When siphonic action begins, Vand through Which passage air from the radiator is sucked as the' siphon is formed.

2. A return seal for a vapor system'comprising a casing having ports in communication with a radiator and With a return pipe, a siphon mounted in said casing and communicating With said return pipe and having a restricted passage in the upper Wall of the arch of the siphon above the level of the liquid When siphonic action begins and through Which passage air is sucked from the radiator intermittently to break the siphon.

3. A return seal for a vapor system comprising a casing having ports in communication With a radiator and With a return pipe, a siphon mounted in said casing and communicating With said return pipe and having a restricted passage above the normal level of the Water when siphonic action begins and communicating With said return pipe, said siphon having a second'restricted passage communicating with said return pipe and located near the bottom of said casing.

4l. An air exhaustfor a vapor or steam heating system comprising a trapl having a siphonic discharge and a port for communication with a heat radiating means and a restricted passage in communication With the arch of the siphon and above the normal level of the liquid when siphonic action begins, the Water of condensation in said trap normally forming a seal for said heat radiating means and the accumulation of an abnormal volume of condensation in said trap, as when said means is cold, setting up siphonic action intermittently to suck the air from said radiating means through said passage, the excess Water in said trap coperating With said passage to alternately make and break the siphon until the air is removed from said heat radiating means.

In Witness whereof, I have hereunto set my hand this 15 day of January, 1916.

ARTHUR P. CROSBY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington. D. C. 

